jim wrote:
Hi, i will soon be laying karndean vinyl floor planks in my house, it
is a 1946 semi and i am concerned whether it has a dpm under the
concrete floor, it has old black tiles down at the moment which i
found under the carpet not sure what they are made of but they are
brittle and blown on the corners (white dust around the edges), they
seem quite well fixed to the concret floor, it looks there is bitumen
on some of the tiles, does anyone know the likelihood of ther e being
a dpm under the concrete for this age of house. I dont have any damp
problems other than the white dust around the edges of these old
tiles, which i think is due to damp of some sort, and i dont want to
lay new floor without treating the concret first. would bitumen do
the job if i spread sand over the top before i put self level
compound down?

Im planning to lift the tiles ,self level with latex, and lay the
floor with pressure sensitive adhesive. do i need to prime the
concrete before latex if so what with? and then do i need to prime
the latex before the adhesive?
Also can i lay the latex in two parts ( i have all downstairs to do)or
does it need to go down all at once. Any advice would be much
appreciated. Thanks

Why go to the trouble of removing the tiles?

Can't you just level what you've got an cover the result with the new
flooring?